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Rectifier - Full Wave ·Rectifier-Rectifier

25Z6GT

Cathode-type full-wave high-vacuum rectifier for transformerless receiver power supplies and voltage-doubler service. Rated for approximately 700 V peak inverse voltage and 75 mA nominal output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: B7-7
Socket code: IO
Base pins: 7
Nominal heater: 25 V / 300 mA

Description

Cathode-type full-wave high-vacuum rectifier for transformerless receiver power supplies and voltage-doubler service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B7-7
Socket code: IO
Base pins: 7
Nominal heater voltage: 25 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B7-7 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 700 V
Rectifier nominal output current: 75 mA
Rectifier peak forward current: 450 mA
Rectifier forward voltage drop: 22 V
Rectifier max heater-cathode voltage: 350 V

Representative row for two identical rectifier sections; ratings are per plate under design-center values.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 700 V
Rectifier nominal output current: 75 mA
Rectifier peak forward current: 450 mA
Rectifier forward voltage drop: 22 V
Rectifier max heater-cathode voltage: 350 V

Second physical rectifier section; electrical properties populated from corresponding identical section.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Heater/filament voltage
25 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating
Tube voltage drop
22 V
At 150 mA DC

Other

DC output current
75 mA
RectifierDoubler
Peak inverse voltage
700 V
RectifierDoubler
RMS supply voltage
235 V
RectifierDoubler
Peak current
450 mA
RectifierDoubler

SECTION 2

Rectifier

Characteristic

Heater/filament voltage
25 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating
Tube voltage drop
22 V
At 150 mA DC

Other

DC output current
75 mA
RectifierDoubler
Peak inverse voltage
700 V
RectifierDoubler
RMS supply voltage
235 V
RectifierDoubler
Peak current
450 mA
RectifierDoubler

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

ACPlateVoltageRMS
235 V
PerPlate
PlateSupplyImpedance
30 ohm
VoltageDoubler;HalfWave
PlateSupplyImpedance
15 ohm
VoltageDoubler;FullWave

SECTION 2

Rectifier

Other

ACPlateVoltageRMS
235 V
PerPlate
PlateSupplyImpedance
30 ohm
VoltageDoubler;HalfWave
PlateSupplyImpedance
15 ohm
VoltageDoubler;FullWave

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

AC Plate Voltage per Plate RMS
235 V
HalfWaveRectifier
Filter Input Capacitor
16 uF
TypicalOperation

Characteristic

DC Output Current per Plate
75 mA
TypicalOperation

SECTION 2

Rectifier

Other

AC Plate Voltage per Plate RMS
235 V
HalfWaveRectifier
Filter Input Capacitor
16 uF
TypicalOperation

Characteristic

DC Output Current per Plate
75 mA
TypicalOperation